Open the template and shift D to open a duplicate template and close out the original. Change the canvas size to 800x800 so you have room to work. You can crop and resize later. Make sure you delete the credit info layer before you begin.

Copy and paste Paper 7 above the background layer and apply your mask. Merge group. Delete the info layer. Copy and paste different papers to different layers of the template. I used most all the papers for the template layers. A couple of the layers I added the Close Up tube.

Copy and paste your main tube of choice, and resize as needed and place where desired. Add dropshadow to the tube.

Now you can place whatever elements you would like, resize as needed and place where desired. Dropshadow your elements and main tube. Here are the elements I used: